From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Specification for the electrical operation of a dynamo for a car.
| Identifier | WestWitteringFiles\E\June1920\ Scan8 | |
| Date | 15th June 1920 | |
| EFC/T. 15.6.20. SPECIFICATION OF ELECTRICAL OPERATION OF DYNAMO FOR R.R. CAR. ----------------------------------- The dynamo, after being run on load on the bench for four hours with an ambient temperature not less than 18°C and at a speed continually adjusted to secure maximum ampere out-put, and operating on a battery at a dynamo terminal voltage not less than 14.0 shall comply with the following:- 1. The temperature of the metal of the carcase, as measured by the insertion of a thermometer bulb in a little metal oil bath in good metallic contact with the carcase, shall not exceed 85°C. 2. The open circuit voltage of the machine immediately after this shall exceed 13.6 at a speed of 540 R.P.M. * 3. The output in this same hot condition shall exceed 9 amperes at an operating terminal voltage of 14.5 for the speed range 900 R.P.M. to 1500 R.P.M. and shall attain a value of 10 amperes at some speed in this range. 4. Above 1500 R.P.M. the ampere output may progressively fall to not less than 6 amperes at 3500 R.P.M. * Car Miles per hour corresponding to a Speed of 540 R.P.M. with various ratios of belt drive. Ratio. Miles per hour. 1.5 10.8 1.56 10.4 1.7 9.65 EFC. | ||